Map View Toolbar is missing?

On the top of my hammer window where all of the tools are, there is a blank space where the 2D grid, 3D grid, Grid size, and load/save window state tools should be. My grid size is stuck on 512hu now and I dont know how to get them back. Anybody know what happened?

You can restore any toolbar (except the undo and redo buttons) under View > Screen Elements. Also, for future reference, nearly every feature of Hammer has a hotkey, and the ones for grid size are the square brackets [ ].